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W also was used by American Columbia to indicate a Western Electric Royalty-due recording, but they hid it on most of their Harmony-VelvetTone-Diva-Clairon electrical recordings. Meanwhile over in England, Columbia tasked Alan Blumlein to develop a recording head which avoided the WE patents  hence the CAX etc. masters. I have no evidence that American Columbia had an alternative system like that.  Victor did. RC was RCA equipment as in BRC vs BVE for Western Electric. SHQ was improved Western Electric Semi-High Quality, soon abbreviated to just S, as in BSHQ or BS.
(B was the 10-inch indicator in these examples.)
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From: Association for Recorded Sound Discussion List <[log in to unmask]> on behalf of Malcolm <[log in to unmask]>
Sent: Saturday, November 9, 2019 6:38:54 PM
To: [log in to unmask] <[log in to unmask]>
Subject: Re: [ARSCLIST] Heart murmur record set

Thanks to everyone who dialed in.
Good to know about the LP, too.
Malcolm

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On 11/9/2019 8:30 AM, Dennis Rooney wrote:
> Dr. George D. Geckeler produced this set. It was released in 1949. The XP
> matrix numbers often mean "experimental". It was also issued on a Columbia
> Lp in the same year as ML 4240. I own the 78s myself and they seem to have
> originated on lacquer discs that were dubbed to produced the commercial
> masters. An examination of the matrix cards at Sony Archives might supply
> more information but that's all I can contribute. Nice gift idea!
>
> DDR
>
> On Sat, Nov 9, 2019 at 1:13 PM Malcolm <[log in to unmask]> wrote:
>
>> A while back I bought a seven record 12", single sided, Columbia 78 set
>> entitled "Stethoscopic Heart Records", Co M-600, which I mean to give to
>> a cardiologist friend for Christmas. I have not been able to come up
>> with any discographic info on it and the liner notes do not quote
>> recording dates, a release date, recording location(s) or even a price
>> for the set.
>> The matrix numbers are XP 29125, XP 29126,  XP 29520, XP 29908, XP
>> 29909, XP 29978 and XP 30060.
>> Help will be gratefully accepted from those who delves into this sort of
>> esoterica. It's outside my normal lines of inquiry.
>> Thanks,
>> Malcolm Rockwell
>>
>